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Finding the Fourth Proportional to 8,613.71, 12,921.78 and 3,065.42

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Solution

The fourth proportional to 8,613.71, 12,921.78 and 3,065.42 is: 4,598.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,613.71 : 12,921.78 = 3,065.42 : x
  2. Step 2: Convert to fraction form
    8,613.71/12,921.78 = 3,065.42/x
  3. Step 3: Cross multiply
    8,613.71x = 12,921.78 × 3,065.42
  4. Step 4: Simplify right side
    8,613.71x = 39,610,618.24
  5. Step 5: Solve for x
    x = 39,610,618.24/8,613.71
  6. Step 6: Final answer
    x = 4,598.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.